圣诞树
#include <windows.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#define PI 3.14159265359
#define T px + scale * r * cosf(theta), py + scale * r * sin(theta)
float sx, sy;
float sdCircle(float px, float py, float r) {
float dx = px - sx, dy = py - sy;
return sqrtf(dx * dx + dy * dy) - r;
}
float opUnion(float d1, float d2) {
return d1 < d2 ? d1 : d2;
}
float f(float px, float py, float theta, float scale, int n) {
float d = 0.0f;
for (float r = 0.0f; r < 0.8f; r += 0.02f)
d = opUnion(d, sdCircle(T, 0.05f * scale * (0.95f - r)));
if (n > 0)
for (int t = -1; t <= 1; t += 2) {
float tt = theta + t * 1.8f;
float ss = scale * 0.9f;
for (float r = 0.2f; r < 0.8f; r += 0.1f) {
d = opUnion(d, f(T, tt, ss * 0.5f, n - 1));
ss *= 0.8f;
}
}
return d;
}
int ribbon() {
float x = (fmodf(sy, 0.1f) / 0.1f - 0.5f) * 0.5f;
return sx >= x - 0.05f && sx <= x + 0.05f;
}
int main(int argc, char* argv[]) {
int n = argc > 1 ? atoi(argv[1]) : 3;
float zoom = argc > 2 ? atof(argv[2]) : 1.0f;
for (sy = 0.8f; sy > 0.0f; sy -= 0.02f / zoom, putchar('\n'))
for (sx = -0.35f; sx < 0.35f; sx += 0.01f / zoom) {
if (f(0, 0, PI * 0.5f, 1.0f, n) < 0.0f) {
if (sy < 0.1f) {
putchar('.');
} else {
if (ribbon()) {
putchar('=');
} else {
putchar("............................#j&o"[rand() % 32]);
}
}
} else {
putchar(' ');
}
}
Sleep(1000);
printf("\n\n\n");
for (size_t i = 0; i < 40; i++) {
putchar(' ');
}
//_sleep(5000);
printf("Merry Christmas, baby~!\n");
Sleep(500);
for (size_t i = 0; i < 40; i++) {
putchar(' ');
}
printf("Never say die.\n");
Sleep(500);
for (size_t i = 0; i < 40; i++) {
putchar(' ');
}
printf("2016/12/24, 最爱你的UP主\n");
getchar();
} 作者：C语言编程__Plus https://www.bilibili.com/read/cv14461692?from=search&;spm_id_from=333.337.0.0 出处：bilibili
